CN208443966U - A kind of partial discharge of switchgear detection device - Google Patents

A kind of partial discharge of switchgear detection device Download PDF

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Publication number
CN208443966U
CN208443966U CN201820443099.6U CN201820443099U CN208443966U CN 208443966 U CN208443966 U CN 208443966U CN 201820443099 U CN201820443099 U CN 201820443099U CN 208443966 U CN208443966 U CN 208443966U
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partial discharge
detection
signal extraction
switchgear
signal
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CN201820443099.6U
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刘红文
王科
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Electric Power Research Institute of Yunnan Power Grid Co Ltd
Electric Power Research Institute of Yunnan Power System Ltd
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Electric Power Research Institute of Yunnan Power System Ltd
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Abstract

The utility model discloses a kind of partial discharge of switchgear detection devices, the detection device includes: ceramic condenser core insulation, Partial discharge signal extraction element, charge indicating device and partial discharge detection device, in which: the charge indicating device includes electrification indicating circuit;The Partial discharge signal extraction element is in parallel with the charge indicating device, and the Partial discharge signal extraction element includes the energy supply capacitor being sequentially connected in series and signal extraction resistance, and partial discharge detection point is equipped between the energy supply capacitor and the signal extraction resistance;It is equipped with coupling capacitor in ceramic condenser core insulation, the ceramic condenser core insulation substring is coupled on the ground line of the charge indicating device;One end of the partial discharge detection device is electrically connected with the partial discharge detection point, other end ground connection.When measuring Partial discharge signal, the utility model measurement is convenient, and detection signal is strong, strong antijamming capability.

Description

A kind of partial discharge of switchgear detection device
Technical field
This application involves shelf depreciation live detection technical fields more particularly to a kind of detection of partial discharge of switchgear to set It is standby.
Background technique
Switchgear is a kind of electrical equipment, and main function is to be generated electricity in electric system, transmitted electricity, the conversion of distribution and electric energy During, opened and closed, controlled and protected electrical equipment.Switchgear in the process of running, after internal dielectric aging Shelf depreciation, alternatively referred to as partial discharge will occur.Under shelf depreciation effect, the insulation characterisitic of dielectric will deteriorate step by step to be caused Electric power accident seriously threatens the safe operation and power supply quality and reliability of electric system.According to statistics, shelf depreciation is to lead The main reason for causing the deterioration of switchgear dielectric, accounts for 85% or more of switchgear accident.
The technology of partial discharge of switchgear detection is with mainly having detection switch cabinet composition of gases within, ultrasonic measurement and transient state electric Wave measurement.Wherein, the method for detection switch cabinet composition of gases within, be in monitoring switch cabinet due to shelf depreciation decomposite it is smelly The components such as oxygen, carbon monoxide, carbon dioxide and dinitrogen pentoxide are the new methods of current switchgear detection shelf depreciation.Ultrasound Detection switch cabinet partial discharge method is the ultrasonic signal generated by detection local discharge signal, judges shelf depreciation It intensity and is positioned.Transient state ground electric wave detection switch cabinet partial discharge method refers to the current traveling wave that shelf depreciation generates The inner surface for often focusing on switch cabinet body, without being directed through cabinet body, fraction passes through the metal shell of switchgear The liner of seam crossing or gas-insulated switch blazes abroad, while generating an instantaneous voltage-to-ground, passes through the metal of switchgear Housing outer surface and go down with passing to.The variation of transient state voltage-to-ground on detection switch cabinet shell is relatively suitble to media interior Electric discharge.
In the method for detection switch cabinet composition of gases within, since switchgear space is larger and is not closed cavity, so It needs to install a large amount of gas sensor, comes the gas component in detection switch cabinet, and the spirit of this method detection shelf depreciation Sensitivity is lower, cannot find faint electric discharge.In ultrasound detection partial discharge of switchgear method, ultrasound detection is usually to hear Abnormal noise, using the ultrasonic signal of detection shelf depreciation, detection sensitivity is relatively low.Transient state ground electric wave detection switch Cabinet partial discharge method, i.e., the method for induction of high frequency electric current, is highly prone to external interference signals on sensor metal polar plate It influences.
Utility model content
This application provides a kind of partial discharge of switchgear detection devices, to solve in existing partial discharge of switchgear detection The technical problem that sensitivity is low, anti-interference ability is weak.
In order to solve the above-mentioned technical problem, the embodiment of the present application discloses following technical solution:
The utility model embodiment discloses a kind of partial discharge of switchgear detection device, and the detection device includes: pottery Porcelain capacitance core insulator, Partial discharge signal extraction element, charge indicating device and partial discharge detection device, in which:
The charge indicating device includes electrification indicating circuit;
The Partial discharge signal extraction element is in parallel with the charge indicating device, the Partial discharge signal extraction element include according to Secondary concatenated energy supply capacitor and signal extraction resistance are equipped with partial discharge between the energy supply capacitor and the signal extraction resistance and examine Measuring point;
It is equipped with coupling capacitor in ceramic condenser core insulation, the ceramic condenser core insulation substring is coupled to the band On the ground line of electric instruction device;
One end of the partial discharge detection device is electrically connected with the partial discharge detection point, other end ground connection.
Preferably, in above-mentioned partial discharge of switchgear detection device, the electrification indicating circuit includes opening of being sequentially connected in series Close and charge indicator light.
Preferably, in above-mentioned partial discharge of switchgear detection device, the coupling capacitor is no partial discharge coupling capacitor, The partial discharge starting voltage of the no partial discharge coupling capacitor is greater than twice of system nominal voltage, and capacitor is 100pF~1000pF, is situated between Less than 1%, capacitance is varied with temperature less than 20% matter loss factor;The capacitor of the energy supply capacitor is 6nF~200nF.
Preferably, in above-mentioned partial discharge of switchgear detection device, the signal extraction resistance is 0.5~1.5K Ω, for extracting the partial discharge of switchgear signal that frequency is 30KHz~300KHz;
The signal extraction resistance is 0.5~1.5 Ω, for extracting the switchgear that frequency is 30MHz~300MHz Local discharge signal;
The signal extraction resistance is 0.05~0.15 Ω, is opening for 300MHz~3000MHz for extracting frequency Close cabinet local discharge signal;
The signal extraction resistance is 0.005~0.015 Ω, for extracting the switch that frequency is 3GHz~300GHz Cabinet local discharge signal.
Preferably, it in above-mentioned partial discharge of switchgear detection device, is all provided on the A phase of switchgear, B phase and C phase power supply line There are ceramic condenser core insulation, the Partial discharge signal extraction element and the charge indicating device.
Compared with prior art, the application has the beneficial effect that
The utility model discloses a kind of partial discharge of switchgear detection device, which includes ceramic condenser core Insulator, Partial discharge signal extraction element, charge indicating device and partial discharge detection device, in which: in ceramic condenser core insulation If coupling capacitor, the effect of sensor and coupling is had both, A phase, B phase or the C phase power supply line of one end connecting switch cabinet are another End is connected with the electrification indicating circuit in charge indicating device, and the electrification indicating circuit other end is connected over the ground, being capable of display switch The electrification situation of cabinet.The Partial discharge signal extraction element is in parallel with the charge indicating device, including the energy supply electricity being sequentially connected in series Hold and signal extraction resistance, energy supply capacitor can provide energy for charge indicating device, ceramic condenser core insulation believes partial discharge Number it is coupled to signal extraction resistance, Partial discharge signal is converted to voltage pulse signal by signal extraction resistance.In the energy supply capacitor Partial discharge detection point, one end of the partial discharge detection device and partial discharge detection point electricity are equipped between the signal extraction resistance Connection, other end ground connection.Partial discharge detection device receives and analyzes the voltage pulse signal.In conclusion in measurement partial discharge letter Number when, the utility model measurement is convenient, and detection signal is strong, strong antijamming capability.
It should be understood that above general description and following detailed description be only it is exemplary and explanatory, not The application can be limited.
Detailed description of the invention
In order to illustrate more clearly of the technical solution of the application, letter will be made to attached drawing needed in the embodiment below Singly introduce, it should be apparent that, for those of ordinary skills, without creative efforts, also Other drawings may be obtained according to these drawings without any creative labor.
Fig. 1 is the basic structure schematic diagram of partial discharge of switchgear detection device provided by the embodiment of the utility model;
Fig. 2 is the usage state diagram of partial discharge of switchgear detection device provided by the embodiment of the utility model;
Description of symbols: 1, ceramic condenser core insulation;2, Partial discharge signal extraction element;21, energy supply capacitor;22, believe Number extract resistance;23, partial discharge detection point;3, charge indicating device;31, it switchs;32, indicator light is charged;4, partial discharge detection device.
Specific embodiment
In order to make those skilled in the art better understand the technical solutions in the application, below in conjunction with the application reality The attached drawing in example is applied, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described implementation Example is only some embodiments of the present application, rather than whole embodiments.Based on the embodiment in the application, the common skill in this field The application protection all should belong in art personnel every other embodiment obtained without making creative work Range.
Referring to Fig. 1, the basic structure schematic diagram of partial discharge of switchgear detection device provided by the embodiment of the utility model. As shown in Figure 1, this detection device include: ceramic condenser core insulation 1, Partial discharge signal extraction element 2, charge indicating device 3 with And partial discharge detection device 4, in which: set coupling capacitor in ceramic condenser core insulation 1, have both the work of sensor and coupling With, A phase, B phase or the C phase power supply line of one end connecting switch cabinet, the electrification indicating circuit string in the other end and charge indicating device 3 Connection, the electrification indicating circuit other end are connected over the ground, are capable of the electrification situation of display switch cabinet.The Partial discharge signal extraction element 2 It is in parallel with the charge indicating device 3, including the energy supply capacitor 21 being sequentially connected in series and signal extraction resistance 22,21 energy of energy supply capacitor Energy enough is provided for charge indicating device 3, Partial discharge signal is couple signal extraction resistance 22 by ceramic condenser core insulation 1, letter Number extract resistance 22 Partial discharge signal is converted into voltage pulse signal.In the energy supply capacitor 21 and the signal extraction resistance 22 Between be equipped with partial discharge detection point 23, one end of the partial discharge detection device 4 is electrically connected with the partial discharge detection point 23, another termination Ground.Partial discharge detection device 4 receives and analyzes the voltage pulse signal.In conclusion this is practical new when measuring Partial discharge signal Type measurement is convenient, and detection signal is strong, strong antijamming capability.
Specifically, traditional ceramic condenser core insulation does not have coupling function, ceramic condenser core insulation in the application Coupling capacitor is set in son 1, the effect of sensor and coupling is had both, since detection device is connected to high voltage bus in the application On, electrification indicating circuit and Partial discharge signal part of detecting required voltage are lower, therefore pass through the ceramic condenser core in the application Insulator 1 couples Partial discharge signal extraction element 2 for Partial discharge signal to being depressured on high voltage bus.
The function that Partial discharge signal extraction element 2 in the embodiment of the present application has both energy supply and Partial discharge signal extracts.Ceramic electrical Hold core insulation 1 and couples Partial discharge signal extraction element 2 for Partial discharge signal, the signal extraction electricity in Partial discharge signal extraction element 2 Resistance 22 can convert voltage pulse signal for Partial discharge signal;Energy supply capacitor 21 can provide energy for electrification indicator light 32, protect The normal work of card electrification indicator light 32.
Further, the electrification indicating circuit includes the switch 31 being sequentially connected in series and electrification indicator light 32.Using this reality When with partial discharge of switchgear detection device in novel, switch 31 is disconnected first, avoids electrification indicating circuit to testing back Play shunting function in road.In addition, the detection of Partial discharge signal needs in conductive environment, therefore the application is according to electrification indicator light 32 bright is gone out to judge whether system is in conductive environment.
In order to optimize above-mentioned technical proposal, the coupling capacitor is no partial discharge coupling capacitor, the no partial discharge coupling The partial discharge inception voltage of capacitor is greater than twice of system nominal voltage, and capacitor is 100pF~1000pF, dielectric dissipation factor Less than 1%, capacitance is varied with temperature less than 20%.Above-mentioned no partial discharge coupling capacitor can effectively take out shelf depreciation letter Number, if the internal capacitance amount of ceramic condenser core insulation varies with temperature larger, it is unfavorable for coupleeing partial discharge for Partial discharge signal Signal extracting device 2.The capacitor of the energy supply capacitor 21 is 6nF~200nF, by ceramic condenser core insulation 1 under power-frequency voltage It is divided with energy supply capacitor 21, so that the voltage after partial pressure is suitable for the electrification indicating circuit, lights electrification indicator light 32.
The local discharge signal that detection device in the application is suitable for switchgear is low frequency (30KHz~300KHz), very The frequency of high frequency (30MHz~300MHz), superfrequency (300MHz~3000MHz) and hyperfrequency (3GHz~300GHz), no With in different frequency ranges, the resistance value of signal extraction resistance 22 is different.When 22 resistance value of signal extraction resistance is When 0.5~1.5K Ω, for extracting the partial discharge of switchgear signal that frequency is 30KHz~300KHz;When the signal extraction When 22 resistance value of resistance is 0.5~1.5 Ω, for extracting the partial discharge of switchgear signal that frequency is 30MHz~300MHz;Work as institute State 22 resistance value of signal extraction resistance be 0.05~0.15 Ω when, for extract frequency be 300MHz~3000MHz switchgear office Portion's discharge signal;When 22 resistance value of signal extraction resistance be 0.005~0.015 Ω when, for extract frequency be 3GHz~ The partial discharge of switchgear signal of 300GHz.
Before use, first will be switched off switch 31, cutting electrification indicating circuit avoids electrification indicating circuit from existing and divides this equipment Flow phenomenon has an impact follow-up test partial discharge result;Partial discharge detection device is in turn, electrically connected to A phase, the B phase of switchgear again And Partial discharge signal is couple Partial discharge signal extraction element 2 by the partial discharge detection point on C phase power supply line, ceramic condenser core insulation 1, Partial discharge signal is converted to voltage pulse signal, the partial discharge by the signal extraction resistance 22 in the Partial discharge signal extraction element 2 Detection device 4 receives and analyzes the voltage pulse signal, and the voltage pulse signal is processed into expression local discharge characteristic Apparent discharge magnitude etc., and above-mentioned data are shown on the display screen of partial discharge detection device 4, according to partial discharge detection device 4 Display is as a result, judge whether there is partial discharge phenomenon;Last closure switch 31, restore electrification indicating circuit, energy supply capacitor 21 It can continue to provide energy for electrification indicator light 32, by electrification indicator light 32 bright or go out and judge whether switchgear is powered.
Referring to fig. 2, the usage state diagram of partial discharge of switchgear detection device provided by the embodiment of the utility model, Fig. 2 For equivalent three-phase electrical power system.Cax, Cbx, Ccx are equivalent electricity of the dielectric under partial discharge effect in switchgear in figure Hold.Ceramic condenser core insulation 1 is equipped on the A phase of switchgear, B phase and C phase power supply line, the Partial discharge signal extracts dress Set 2 and the charge indicating device 3.When needing A phase in detection switch cabinet, B phase and C phase power supply line existing with the presence or absence of shelf depreciation As when, partial discharge detection device 4 can successively be connect with the partial discharge detection point 23 under the A phase of switchgear, B phase and C phase power supply line And it tests.
Since embodiment of above is that reference combination is illustrated on other modes, have between different embodiments There is identical part, identical, similar part may refer to each other between each embodiment in this specification.Herein no longer in detail It illustrates.
It should be noted that in the present specification, the terms "include", "comprise" or its any other variant are intended to Non-exclusive inclusion, so that the circuit structure, article or the equipment that include a series of elements not only include those elements, It but also including other elements that are not explicitly listed, or further include solid by this circuit structure, article or equipment Some elements.In the absence of more restrictions, the element for thering is sentence "including a ..." to limit, it is not excluded that including There is also other identical elements in the circuit structure of the element, article or equipment.
Those skilled in the art will readily occur to the application after considering specification and practicing the disclosure of utility model here Other embodiments.This application is intended to cover any variations, uses, or adaptations of the utility model, these changes Type, purposes or adaptive change follow the general principle of the application and undocumented in the art including the application Common knowledge or conventional techniques.The description and examples are only to be considered as illustrative, the true scope and spirit of the application It is pointed out by the content of claim.
Above-described the application embodiment does not constitute the restriction to the application protection scope.

Claims (3)

1. a kind of partial discharge of switchgear detection device, which is characterized in that the detection device includes: ceramic condenser core insulation (1), Partial discharge signal extraction element (2), charge indicating device (3) and partial discharge detection device (4), in which:
The charge indicating device (3) includes electrification indicating circuit;
The Partial discharge signal extraction element (2) is in parallel with the charge indicating device (3), the Partial discharge signal extraction element (2) Including the energy supply capacitor (21) being sequentially connected in series and signal extraction resistance (22), in the energy supply capacitor (21) and the signal extraction Partial discharge detection point (23) is equipped between resistance (22);
Coupling capacitor is equipped in the ceramic condenser core insulation (1), the ceramic condenser core insulation (1) is series at described On the ground line of charge indicating device (3);
One end of the partial discharge detection device (4) is electrically connected with the partial discharge detection point (23), other end ground connection;
The electrification indicating circuit includes the switch (31) being sequentially connected in series and electrification indicator light (32);
The coupling capacitor is no partial discharge coupling capacitor, and the partial discharge starting voltage of the no partial discharge coupling capacitor is greater than two Times system nominal voltage, capacitor are 100pF~1000pF, and less than 1%, capacitance varies with temperature to be less than dielectric dissipation factor 20%;The capacitor of the energy supply capacitor (21) is 6nF~200nF.
2. partial discharge of switchgear detection device according to claim 1, which is characterized in that the signal extraction resistance (22) resistance value is 0.5~1.5K Ω, for extracting the partial discharge of switchgear signal that frequency is 30KHz~300KHz;
Signal extraction resistance (22) resistance value is 0.5~1.5 Ω, for extracting the switchgear that frequency is 30MHz~300MHz Local discharge signal;
Signal extraction resistance (22) resistance value is 0.05~0.15 Ω, is opening for 300MHz~3000MHz for extracting frequency Close cabinet local discharge signal;
Signal extraction resistance (22) resistance value is 0.005~0.015 Ω, for extracting the switch that frequency is 3GHz~300GHz Cabinet local discharge signal.
3. partial discharge of switchgear detection device according to claim 1, which is characterized in that A phase, B phase and the C of switchgear The ceramic condenser core insulation (1), the Partial discharge signal extraction element (2) and electrification instruction are equipped on phase power supply line Device (3).
CN201820443099.6U 2018-03-29 2018-03-29 A kind of partial discharge of switchgear detection device Active CN208443966U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108427068A (en) * 2018-03-29 2018-08-21 云南电网有限责任公司电力科学研究院 A kind of partial discharge of switchgear detection device and method
CN110161383A (en) * 2019-04-30 2019-08-23 云南电网有限责任公司电力科学研究院 A kind of detection device for partial discharge of switch cabinet

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108427068A (en) * 2018-03-29 2018-08-21 云南电网有限责任公司电力科学研究院 A kind of partial discharge of switchgear detection device and method
CN110161383A (en) * 2019-04-30 2019-08-23 云南电网有限责任公司电力科学研究院 A kind of detection device for partial discharge of switch cabinet
CN110161383B (en) * 2019-04-30 2020-07-28 云南电网有限责任公司电力科学研究院 Switch cabinet partial discharge detection device

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